WOLFRAM SYSTEM MODELER
ThickEdgedOrificeThicked edged orifice flow model |
SystemModel["Modelica.Fluid.Fittings.Orifices.ThickEdgedOrifice"]
This information is part of the Modelica Standard Library maintained by the Modelica Association.
This component models a thick edged orifice with sharp corners in the overall flow regime for incompressible and single-phase fluid flow through an arbitrary shaped cross sectional area (square, circular, etc.) considering influence of surface roughness. It is expected that also compressible fluid flow can be handled up to about Ma = 0.3. It is assumed that neither mass nor energy is stored in this component. In the model basically a function is called to compute the mass flow rate as a function of pressure loss for a thick edged orifice. Also the inverse of this function is defined, and a tool might use this inverse function instead, in order to avoid the solution of a nonlinear equation.
The details of the model are described in the documentation of the underlying function.
allowFlowReversal |
Value: system.allowFlowReversal Type: Boolean Description: = true to allow flow reversal, false restricts to design direction (port_a -> port_b) |
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dp_start |
Value: 0.01 * system.p_start Type: AbsolutePressure (Pa) Description: Guess value of dp = port_a.p - port_b.p |
m_flow_start |
Value: system.m_flow_start Type: MassFlowRate (kg/s) Description: Guess value of m_flow = port_a.m_flow |
m_flow_small |
Value: if system.use_eps_Re then system.eps_m_flow * system.m_flow_nominal else system.m_flow_small Type: MassFlowRate (kg/s) Description: Small mass flow rate for regularization of zero flow |
show_T |
Value: true Type: Boolean Description: = true, if temperatures at port_a and port_b are computed |
show_V_flow |
Value: true Type: Boolean Description: = true, if volume flow rate at inflowing port is computed |
geometry |
Value: Type: Geometry Description: Geometry of thick edged orifice |
port_a |
Type: FluidPort_a Description: Fluid connector a (positive design flow direction is from port_a to port_b) |
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port_b |
Type: FluidPort_b Description: Fluid connector b (positive design flow direction is from port_a to port_b) |
system |
Type: System Description: System wide properties |
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state_a |
Type: ThermodynamicState Description: State for medium inflowing through port_a |
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state_b |
Type: ThermodynamicState Description: State for medium inflowing through port_b |
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state_dp_small |
Type: ThermodynamicState Description: Medium state to compute dp_small |
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geometry |
Type: Geometry Description: Geometry of thick edged orifice |